Example setting TieredMergePolicy for Solr 3.3 or 3.4?

[Burton-West, Tom]

Hello,

The TieredMergePolicy has become the default with Solr 3.3, but the 
configuration in the example uses the mergeFactor setting which applys to the 
LogByteSizeMergePolicy.

How is the mergeFactor interpreted by the TieredMergePolicy?

Is there an example somewhere showing how to configure the Solr 
TieredMergePolicy to set the parameters:
setMaxMergeAtOnce, setSegmentsPerTier, and setMaxMergedSegmentMB?

I tried setting setMaxMergedSegmentMB in Solr 3.3
<mergePolicy class="org.apache.lucene.index.TieredMergePolicy">
      <int name="maxMergeAtOnce">20</int>
      <int name="segmentsPerTier">40</int>
     <!--400GB /20=20GB  or 20000MB-->
<double name="setMaxMergedSegmentMB">20000</double>
    </mergePolicy>


and got this error message
"SEVERE: java.lang.RuntimeException: no setter corrresponding to 
'setMaxMergedSegmentMB' in org.apache.lucene.index.TieredMergePolicy"


Tom Burton-West